It's probably your nova's end or your short term buffs ending, I've noticed when nova's end (not break) or when short term buffs end you stop casting and I've had the samething you described happen with frostbomb =(

I'm not sure ive experienced the issue youre having, but i have noticed both while playing shadow priest and mage that if you use spectral guise when you have frost bomb on you it sometimes won't explode. may be relevant

I'm not sure ive experienced the issue youre having, but i have noticed both while playing shadow priest and mage that if you use spectral guise when you have frost bomb on you it sometimes won't explode. may be relevant

sometimes im casting and all of a sudden my character will just stop casting as if i moved or jumped
happens a lot with frostbomb

have definitely noticed this. same thing happens to my warlock, where i'll dismount and my next cast will get interrupted, although after running a few tests i noticed the problem is the glyph that lets your mounts walk on water.

I noticed this for frost bomb and ring of frost too , it's pretty rare but it's so annoying when it happens. Did also get hit by a double bomb once (95k+98k at the same time) but couldn't do the same even if i use fire blast at the exact same moment the bomb is exploding